RE: Digital Logic µFR NFC Card Reader - part 4: first meaningful ISO14443 / APDU conversation

Jan Cumps — Fri, 18 Dec 2020 19:09:38 GMT

I've refactored a bit.

In my design, the reader checks the card type, and returns an object of that type.

The type of card returned isn't depending on the reader though.

The reader may have capabilities to talk or not talk to certain cards, but it isn't the one that needs to know.

Else, I'd have to create a reader for many card types, while the reader capabilities don't change.

I'm going to restrict the reader knowledge to "ability to serve according to smartcard standards"

So I moved it out to the factory.

The standard factory knows how to create common known cards. And how to use a reader.

For specialised cards, I'll provide a specialised factory. It can use the existing reader class, but knows how to create specialised cards.

For the Infineon Security2Go cards, I'll create a S2GoFactory and a CardS2Go class.

The factory will use reader API to check if the card is of the S2Go type, and if yes, create a CardS2Go object.

Else it will fail.

The CardS2Go will be a child of the CardISO14443 class. Because it uses that class' functions. But additionally runs a S2Go specific application API.